// Load zone.js for the server.
import "zone.js/dist/zone-node";
import "reflect-metadata";
import { readFileSync, writeFileSync, existsSync, mkdirSync } from "fs";
import { join } from "path";

import { enableProdMode } from "@angular/core";
// Faster server renders w/ Prod mode (dev mode never needed)
enableProdMode();

// Import module map for lazy loading
import { provideModuleMap } from "@nguniversal/module-map-ngfactory-loader";
import { renderModuleFactory } from "@angular/platform-server";
import { ROUTES } from "./static.paths";

// * NOTE :: leave this as require() since this file is built Dynamically from webpack
const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require("./server/main");

const BROWSER_FOLDER = join(process.cwd(), "browser");

// Load the index.html file containing referances to your application bundle.
const index = readFileSync(join("browser", "index.html"), "utf8");

let previousRender = Promise.resolve();

// Iterate each route path
ROUTES.forEach(route => {
  const fullPath = join(BROWSER_FOLDER, route);

  // Make sure the directory structure is there
  if (!existsSync(fullPath)) {
    mkdirSync(fullPath);
  }

  // Writes rendered HTML to index.html, replacing the file if it already exists.
  previousRender = previousRender
    .then(_ =>
      renderModuleFactory(AppServerModuleNgFactory, {
        document: index,
        url: route,
        extraProviders: [provideModuleMap(LAZY_MODULE_MAP)]
      })
    )
    .then(html => writeFileSync(join(fullPath, "index.html"), html));
});
